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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * CryptoDES.h</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *  Created on: 18.10.2016</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *      Author: dev_zzo</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> */</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="preprocessor">#ifndef CRYPTODES_H_</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#define CRYPTODES_H_</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &lt;stdint.h&gt;</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#include &quot;../Common.h&quot;</span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">/* Notes on cryptography in DESFire cards</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">The EV0 was the first chip in the DESFire series. It makes use of the TDEA</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">encryption to secure the comms. It also employs CBC to make things more secure.</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">CBC is used in two &quot;modes&quot;: &quot;send mode&quot; and &quot;receive mode&quot;.</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment">- Sending data uses the same structure as conventional encryption with CBC</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment">  (XOR with the IV then apply block cipher)</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">- Receiving data uses the same structure as conventional decryption with CBC</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">  (apply block cipher then XOR with the IV)</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">Both operations employ TDEA encryption on the PICC&#39;s side and decryption on</span></div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">PCD&#39;s side.</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">/* Key sizes, in bytes */</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="preprocessor">#define CRYPTO_DES_KEY_SIZE         8 </span><span class="comment">/* Bytes */</span><span class="preprocessor"></span></div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">#define CRYPTO_2KTDEA_KEY_SIZE      (CRYPTO_DES_KEY_SIZE * 2)</span></div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#define CRYPTO_3KTDEA_KEY_SIZE      (CRYPTO_DES_KEY_SIZE * 3)</span></div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">#define CRYPTO_DES_BLOCK_SIZE       8 </span><span class="comment">/* Bytes */</span><span class="preprocessor"></span></div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">/* Prototype the CBC function pointer in case anyone needs it */</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="keyword">typedef</span> void (*CryptoTDEACBCFuncType)(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Plaintext, <span class="keywordtype">void</span> *Ciphertext, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="keywordtype">void</span> CryptoEncrypt2KTDEA(<span class="keyword">const</span> <span class="keywordtype">void</span> *Plaintext, <span class="keywordtype">void</span> *Ciphertext, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="keywordtype">void</span> CryptoDecrypt2KTDEA(<span class="keyword">const</span> <span class="keywordtype">void</span> *Plaintext, <span class="keywordtype">void</span> *Ciphertext, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="keywordtype">void</span> CryptoEncrypt2KTDEA_CBCSend(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Input, <span class="keywordtype">void</span> *Output, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="keywordtype">void</span> CryptoDecrypt2KTDEA_CBCSend(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Input, <span class="keywordtype">void</span> *Output, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="keywordtype">void</span> CryptoEncrypt2KTDEA_CBCReceive(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Input, <span class="keywordtype">void</span> *Output, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="keywordtype">void</span> CryptoDecrypt2KTDEA_CBCReceive(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Input, <span class="keywordtype">void</span> *Output, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="keywordtype">void</span> CryptoEncrypt3KTDEA_CBCSend(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Plaintext, <span class="keywordtype">void</span> *Ciphertext, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="keywordtype">void</span> CryptoDecrypt3KTDEA_CBCReceive(uint16_t Count, <span class="keyword">const</span> <span class="keywordtype">void</span> *Plaintext, <span class="keywordtype">void</span> *Ciphertext, <span class="keywordtype">void</span> *IV, <span class="keyword">const</span> uint8_t *Keys);</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;INLINE <span class="keywordtype">void</span> CryptoPaddingTDEA(uint8_t *Buffer, uint8_t BytesInBuffer, <span class="keywordtype">bool</span> FirstPaddingBitSet) {</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    uint8_t PaddingByte = FirstPaddingBitSet &lt;&lt; 7;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    uint8_t i;</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keywordflow">for</span> (i = BytesInBuffer; i &lt; CRYPTO_DES_BLOCK_SIZE; ++i) {</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        Buffer[i] = PaddingByte;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        PaddingByte = 0x00;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    }</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;}</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* CRYPTODES_H_ */</span><span class="preprocessor"></span></div></div><!-- fragment --></div><!-- contents -->
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